STODD03 Datasheet, PDF (1/16 Pages) STMicroelectronics – Synchronous rectification

STODD03
Monolithic 2-channel power management
for high-definition ODD with integrated power switch
Features
■ 1.2 MHz DC-DC current mode PWM converter
■ Input voltage from 4 V up to 6 V
■ Step-down 3.3 V fixed output voltage, up to 700
mA load
■ Step-up output current up to 500 mA
■ 2% step-down output voltage tolerance
■ 3% step-up output voltage tolerance
■ Synchronous rectification
■ Step-down power-save mode at light load
■ Typical efficiency: 90%
■ Internal soft-start
■ Enable functions
■ True cutoff function for step-up converter
■ Integrated motor control power switch
■ Uses tiny capacitors and inductors
■ Available in QFN16 (4 x 4 mm)
Description
The STODD03 is a 2-channel power
management device intended for Blu-Ray
applications based on high density optical storage
devices. It integrates one step-down converter
able to provide 3.3 V fixed output voltage up to
700 mA load, and one step-up converter to
provide the power supply needed for the blue
laser in applications where only 5 V input voltage
is available. The step-up output voltage is
adjustable in the range from 6.5 V to 14 V, with
current capability up to 500 mA. Both step-down
and step-up channels integrate low R_{DS_ON} N-
channel and P-channel MOSFETs, allowing high
DC-DC efficiencies. The enable function with true
Table 1. Device summary
Part number
Order code
STODD03
STODD03PQR
QFN16L (4 x 4 mm)
shutdown makes the step-up section particularly
suitable for optical storage power management
applications. Moreover, the STODD03 has a 1 A
integrated power switch for motor control power
supply. The high switching frequency allows the
use of tiny SMD components. Low output ripple
voltage is achieved thanks to the current mode
PWM topology. The device includes soft-start
control, thermal shutdown, and peak current limit
to prevent damage due to accidental overload.
The STODD03 is packaged in a QFN16 (4 x 4
mm).
Marking
ODD03
Package
QFN16 (4 x 4 mm)
August 2011
Doc ID 018980 Rev 1
1/16
www.st.com
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